Best Things dwell out of Sight — W and M

Best Things dwell out of Sight 1
The Pearl-the Just-Our Thought.

Most shun the Public Air
Legitimate, and Rare-

The Capsule of the Wind 5
The Capsule of the Mind

Exhibit here, as doth a Burr-
Germ's Germ be where?
(F.1012/J.998)
[1–8]:: Wind and Mind is a play of letter W and M. It answers this poem's question at the end.
[1] Best things:: indicating our pearl-like just thoughts in the next line.
[2] Pearl, Just, Thought:: a thought of justice and fair as the pearl.
[5] Wind:: the twist of one's mind.
[5, 6, 7] Wind, Mind, Exhibit here:: W is the reverse of M. These two lines are arranged in pairs as a hint.
[7] Burr:: annoying thing that sticks; a twisted mind that sticks on best things like bacterium.
[8] Germ:: the seed of a disease (OED 1803, 1871). Germ:: the origin.